Abstract
This paper describes the results of a joint research program of the Budapest University of Technology and Economics and the Paks Nuclear Power Plant (NPP) to modify the radioactive wastewater treatment technology for the evaporator bottom tanks in the NPP. The main characteristics of the modified technology were that we first removed all the long life radioactive isotopes with an underwater plasma torch reactor (UPTR), micro and ultrafiltration and a cesium selective ion exchanger stable at pH~12–13. After the separation of precipitated borate crystals, the remaining liquid was released as chemical waste.
Highlights
There are about 6000 m3 of concentrated evaporator bottom as liquid radioactive waste in the tanks of the Hungarian Nuclear Power Plant (NPP) Paks
This paper describes the results of a joint research program of the Budapest Uni- versity of Technology and Economics and the Paks Nuclear Power Plant (NPP) to modify the radioactive wastewater treatment technology for the evaporator bottom tanks in the NPP
The original treatment technology starts with the underwater plasma torch reactor (UPTR) destruction of the organic complex builders followed by crystallization of inorganic borates using nitric acid acidification
Summary
There are about 6000 m3 of concentrated evaporator bottom as liquid radioactive waste in the tanks of the Hungarian NPP Paks. The original treatment technology starts with the underwater plasma torch reactor (UPTR) destruction of the organic complex builders followed by crystallization of inorganic borates using nitric acid acidification. In our laboratory experiments we used evaporator bottom samples pre-treated in the NPP by UPTR After this treatment the cobalt ions bound to EDTA and other organic complex build- ers were oxidized and the radioactive cobalt content was filtered out. Based on the nonradioactive experiments with simulated solutions, the second step was we investigated the selective separation of cesium radioactive isotopes from the evaporator bottom samples pre-treated in the NPP by underwater plasma torch. Finishing the acid dose we stirred the solution and the crystals for an additional 30 min- utes, we filtered the crystals and dried them at 96oC for 12 hours In this experiment we separated as on an average 206 g dry crystals and 1042.5 g of liquid. Drying the sodium metaborate crystals below 55oC does not release bounded water [4]
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